Forces Review-Hinds

Which law is the reason that a ball rolling through the grass eventually comes to a stop?

• Newton's First Law

• Newton's Second Law

• Newton's Third Law

• Law of Conservation of Momentum

Answer explanation

Newton's First Law states that an object in motion stays in motion unless acted upon by an external force. The grass provides friction, which acts as that external force, causing the ball to eventually stop.

Which Law says the force created is due to an objects mass and acceleration?

• Newton's First Law

• Newton's Second Law

• Newton's Third Law

• Law of Conservation of Momentum

Answer explanation

Newton's First Law states that an object in motion stays in motion unless acted upon by an external force. The grass provides friction, which acts as that external force, causing the ball to eventually stop.

Tags

NGSS.MS-PS2-2

Which law is the reason that a rocket blasts into the air when the fuel burns downward?

• Newton's First Law

• Newton's Second Law

• Newton's Third Law

• Law of Conservation of Momentum

Answer explanation

Newton's Third Law states that for every action, there is an equal and opposite reaction. When a rocket burns fuel downward, the action of the exhaust gases pushing down results in the reaction of the rocket being propelled upward.

What is the effect of mass on inertia?

• More mass means less inertia.

• Mass has no effect on inertia.

• More mass means more inertia.

• Only shape, not mass, affects inertia.

What does it mean when forces are balanced?

• The object is accelerating.

• The object is moving at a constant velocity.

• The object is at rest.

• Both B and C are correct.

Answer explanation

When forces are balanced, the net force is zero, meaning the object is either at rest or moving at a constant velocity. Therefore, both options B (constant velocity) and C (at rest) are correct.

Which of the following best describes inertia?

• The tendency of an object to resist changes in its velocity.

• The rate of change of momentum of an object.

• The quantity of motion of a moving body, measured as a product of its mass and velocity.

• The gravitational pull on an object.

​ (a)   is when ​ (b)   is the only force acting on an object. The number for this value on Earth is ​ (c)  

• free fall
• gravity
• 9.8 m/s2

Tags

NGSS.MS-PS2-4

Draw an arrow that shows the centripetal force.

Tags

NGSS.HS-PS2-1

This is an example of..........

• Newton's First Law
• Newton's Second Law
• Newton's Third Law

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Match the descriptions to the words they describe.

• net force

• The rate at which an object changes its velocity

• terminal velocity

• The overall force acting on an object when all individual forces are combined

• acceleration

• a friction-like force of objects that move through the air

• force

• The highest speed a falling object with reach (like a parachuter falling at a constant speed)

• air resistance

• a push or pull

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1